B ecosystem. They include abiotic factors and biotic factors.
The last option is corrrect because when one species move away from an environment or die it lead to decrease in biodiversity as well as the overall health of ecosystem also decreases.
The genes appeared in a later generation, they were dormant.
Answer:
Intracellular Communication
Neuron is called the basic unit of the nervous system because all the parts of nervous system whether it is brain or spinal cord or cranial or spinal nerves all are made of neurons.
